TLE4942-1C 查看數據表（PDF） - Infineon Technologies

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TLE4942-1C

Differential Two-Wire Hall Effect Sensor IC

Infineon Technologies 

TLE4942-1

TLE4942-1C

I

IHIGH

Xn

Xn+1

Xn+2

ILOW

t1

T

Duty = t1 / T x 100%

t

AET03195

Figure 7 Definition of Duty Cycle

PWM Current Interface

Between each magnetic transition and the rising edge of the corresponding output pulse

the output current is Low for tpre-low in order to allow reliable internal conveyance.

Following the signal pulse (current is High) is output.

If the magnetic differential field exceeds ∆BEL, the output pulse lengths are 90 µs or

180 µs respectively, depending on the direction of rotation.

When the magnitude of the magnetic differential field is below ∆BEL, the output pulse

lengths are 360 µs and 720 µs respectively, depending on left or right rotation. Due to

decreasing cycle times at higher frequencies, these longer pulses are only output up to

frequencies of approximately 117 Hz. For higher frequencies and differential magnetic

fields below ∆BEL, the output pulse lengths are 90 µs or 180 µs respectively.

If the magnitude of the magnetic differential field is below B ∆ , Warning the output pulse

length is 45 µs. The warning output is dominant, this means that close to the limit airgap

the direction and the assembly position information are disabled.

For magnitudes of the magnetic differential field below ∆BLimit, signal is lost.

In case no magnetic differential signal is detected for a time longer than the stand still

period TStop, the stop pulse is output. Typically with the first output stop pulse, the circuitry

reverts to the uncalibrated mode.

Data Sheet

17

V 3. 1, 2005-02

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